Abstract
Sn1−xMnxTe (x = 0, 0.09, 0.15, 0.20) bulk materials were prepared by melt spinning combined with spark plasma sintering process. Nanoscale grains were obtained, and the solid solubility of Mn was much enhanced by the ultrafast-cooling synthesis technique. The maximum of Seebeck coefficient and power factor are 242 µVK−1 and 19.97 µW cm−1K−2 at 873 K with the doping concentration of 15 at% Mn. A large amount of grain boundaries and doped atoms improve the scattering of heat-carrying phonons in a wide range of frequencies, and the scattering mechanisms are also explained by theoretical calculation. As a result, the minimum of lattice thermal conductivity is 0.66 µVK−1 at 873 K, the corresponding figure of merit is 1.26 for Sn0.85Mn0.15Te sample. This value is improved by 35% comparing with previously reported result. Our work indicates that melt spinning process is effective to develop SnTe related thermoelectric materials with excellent thermoelectric properties, which has the widespread commercial value and the prospects for development.
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Acknowledgements
This work was supported by the Research Fund of the National Natural Science Foundation of China [Grant Number 51774239]; Young Talent fund of University Association for Science and Technology in Shaanxi, China [Grant Number 20160108].
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Yang, B., Li, S., Li, X. et al. Microstrucutre and thermoelectric properties of rapidly prepared Sn1−xMnxTe alloys. J Mater Sci: Mater Electron 29, 18949–18956 (2018). https://doi.org/10.1007/s10854-018-0018-9
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DOI: https://doi.org/10.1007/s10854-018-0018-9